ascophyllum nodosum is a large brown alga, rockweed, knotted kelp or egg wrack.

alga algae algee also ascophyllum background beach bladder brown bulbous buoyancy coast coastal edible float floatation floating flora food green kelp knotted known lake large marine maritime mechanisms natural nature nodosum ocean pattern phaeophyceae plant rockweed sand seashore seaside seaware seaweed shore shoreline small tangle texture underwater variety vegetable vegetation vesiculosus water wave with wrack